Google AdWords Displays Ad Scores: Pscore, mCPC & thresh

A WebmasterWorld thread has discussion around one advertiser noticing Google displaying three scores directly under a Google Netherlands ad. Here is a picture of the ad with the scores underneath the ad:

So I began to do some research and it seems someone else saw the score for a different search today as well, on Google.de. Here is a screen capture, but even though the webmaster highlighted the score with the middle ad, I have a feeling the score is associated with the top ad: